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Stemco · Brakes & Wheel End
359-5995
In stock · ships from Knoxville
This Stemco hub cap window kit replaces the sight glass on heavy-duty truck and trailer hub caps, letting you visually check lubricant level and condition without removing the cap.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 15 applications
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All confirmed applications for this part number.
Freightliner
GMC
Sterling
Other applications
Freightliner
GMC
Sterling
Other applications
Fitment list provided by Wheeler Fleet Solutions; may not be complete. Always confirm with VIN and hub cap model.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 9 of 9.
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It includes a 3-1/2 inch diameter window, gasket, O-ring, and vent plug. Typical replacement is needed when the window becomes cracked, cloudy, or begins to leak oil. The kit is designed for Stemco 340-4009 series hub caps and fits many Class 6–8 axle applications.
Part Number: 359-5995
WINDOW KIT FOR 4009 CAP
Unit: ea
Dealer: Knox Trailers
Compatibility, alternatives, and more
Parts commonly needed alongside brakes & wheel end
